if it's events, it could be some driver that is acting up. you can try
to remove as much kernel modules related to hardware as possible
(typically network, or bluetooth/wireless if this is a laptop)
if you feel up to it, you can try perf as root:
install it with
yum install perf -y
and then run
perf top
it's top on steroids, so can be overwhelming. but you should be able to
dig a lot deeper into what is happening.
good luck
stijn
On 01/23/2015 06:53 AM, [email protected] wrote:
Does the box have hypertheading enabled? I've seen some wired behavior
ocassionaly with hypertheading because it essentially makes the output of top a
little deceptive.
The other thing is what category it the cpu utilization for instance it's not
uncommon for a core to go to 100% due to io wait (wa in top).
In this case a change of the scheduler may help. I often find the default which
is cfq is not right for servers.
Sent from my BlackBerry 10 smartphone.
Original Message
From: Ian A Taylor
Sent: Thursday, January 22, 2015 12:23
To: Stijn De Weirdt; Scientific Linux Users
Subject: Re: cpu process load jumps to 100%
Stijn
Thanks for reply
The last 3 times it has been
events/17
That has jumped to 100 utilization
Is this saying processor 17 is flaky ?
How would I test that ?
Regards
Ian t
On 22/01/15 17:13, Stijn De Weirdt wrote:
hi ian,
run top to see which process is causing the load.
if it is kipmi, try to add this to the active kernel entry in
/etc/grub.conf
ipmi_si.kipmid_max_busy_us=100
and reboot if you can. if you can't reboot, there's probably a way to
write to /sys to set it (but it will be non-permanent).
stijn
On 01/22/2015 05:48 PM, Ian A Taylor wrote:
Sir/Madam
I have a 64bit machine on which I run SL6
I upgraded to the latest kernel
uname -a
Linux AAAAAAAA 2.6.32-504.3.3.el6.x86_64 #1 SMP Tue Dec 16 14:29:22 CST
2014 x86_64 x86_64 x86_64 GNU/Linux
Since I have done this then the machine behaves ok for 25 mins then
The process load on one of the CPU jumps up to 100%
There are 40 processor on this machine
processor : 39
vendor_id : GenuineIntel
cpu family : 6
model : 62
model name : Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz
stepping : 4
microcode : 1046
cpu MHz : 2499.983
cache size : 25600 KB
physical id : 1
siblings : 20
core id : 12
cpu cores : 10
apicid : 57
initial apicid : 57
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall
nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good
xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx
smx est tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt
tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm ida arat epb
xsaveopt pln pts dts tpr_shadow vnmi flexpriority ept vpid fsgsbase smep
erms
bogomips : 4999.35
clflush size : 64
cache_alignment : 64
address sizes : 46 bits physical, 48 bits virtual
power management:
There is nothing to indicate why this is happening in /var/log/messages
Originally I had a problem with kondemand but I solved this by turning
off service cpuspeed
However I am not clear why the process load jumps up to 100%
Any help would be sincerely appreciated
Thanking you.
Yours sincerely
Ian Taylor
University of St.Andrews,
School of Physics & Astronomy,
North Haugh,
St.Andrews,
Fife KY16 9SS,
Scotland.
e-Mail :- [email protected]
Tel :- (0)1334-463141
Fax :- (0)1334-463104
The University of St Andrews
is a charity registered in
Scotland : No SC013532.
